Clock



FIG. 1 is a perspective view as viewed from a portion above a clock embodying my new design;

FIG. 2 is a perspective view as viewed from a portion rear thereof;

FIG. 3 is an elevational view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a left side view thereof. 

The ornamental design for a clock, as shown and described. 